Spray nozzle



Dec. 20, 1966 J. S.-M0CARTNEY ETAL SPRAY NOZZLE Original Filed Sept. 13, 1962 5 Sheets-Sheet 1 FIG. 4

FIG. 48

H T f INVENTORS JAMES S. McCARTNEY RICHARD V. DeLEO AT TORN E YS Dec. 20, 1966 J. 5. MC f ETAL 3,292,868

SPRAY NOZ ZLE Original Filed Sept. 13, 1962 5 Sheets-Sheet 2 54 PRESSURIZED 8 f" 8 a CARRIER FLUID 4 6Q Jr PRESSURIZED 2'3 i Q SOURCE OF LIQUID 578 58b FIG. l2-

LOW R-LARGE VOLUME FLOW so I5OMPH Y/A 3 o 5 MPH INVENTORS 20: JAMES s. McCARTNEY H'GHER LLOW RICHARD v. DeLEO VOLUME FLOW F ATTORNEYS Dec. 20, 1966 J. 5 MQCARTNEY ETAL SPRAY NOZ ZLE 5 Sheets-Sheet 3 Original Filed Sept. 13, 1962 INVENTORS' JAMES S. McCARTNEY BY RICHAR De LEO ATTORNEYS United States Patent 3,292,868 SPRAY NOZZLE James S. McCartney, St. Paul, and Richard V. De Leo,

Hopkins, Minn., assignors to Aero Spray, Inc., Minneapolis, Minn., a corporation of Minnesota Original application Sept. 13, 1962, Ser. No. 223,428, now Patent No. 3,237,870, dated Mar. 1, 1966. Divided and this application Feb. 25, 1966, Ser. No. 530,206 4 Claims. (Cl. 239-422) This is a divisional application of Serial No. 223,428, filed September 13, 1962, now Patent No. 3,237,870.

This invention relates to a new and novel spray nozzle. More particularly, this invention relates to a new and novel spray nozzle wherein the liquid to be sprayed is discharged under pressure to be moved forwardly over a surface and on said surface is permitted to diverge in a forward direction, there being provided a carrier fluid passing adjacent said surface to cause the liquid to form a film on said surface and break the liquid into small droplets and causes the droplets to move in the direction desired.

An object of this invention is to provide a new and novel spray nozzle to discharge under pressure a stream of liquid flowing in a given direction and break said liquid stream into a film and then into fine droplets by a separate stream of pressurized fluid that is at least initially flowing in the same general direction as the discharged stream of liquid.

A further object of this invention is to provide a new and novel spray nozzle for forwardly conveying and discharging a stream of liquid under pressure onto a planar surface and subject the discharged stream to the action of a first high velocity fluid stream that causes the liquid on said planar surface to first form a thin film and then droplets and subsequently to the action of a second high velocity fluid stream as the intermingled first stream of fluid with liquid leaves the planar surface. Another object of this invention is to provide a new and novel spray nozzle for carrying out the immediately proceeding object and additional to cause each of said streams of fluid to be deflected through a curved path forward of the location of the discharge of liquid onto the planar surface.

The invention is illustrated with reference to the drawings wherein corresponding numerals refer to the same parts and in which:

FIGURE 1 is a vertical, longitudinal, cross-sectional view of the first embodiment of the spray nozzle of this invention together with portions of the supply lines connected to said nozzle, said view being generally taken along the line and in the direction of arrows 1-1 of FIGURE 2;

FIGURE 2 is an end view, part in cross-section, of the spray nozzle of the first embodiment, said view being generally taken along the line and in the direction of the arrows 22 of FIGURE 1;

FIGURE 3 is an enlarged fragmentary longitudinal cross-sectional view of a liquid discharge tube of the first embodiment, said view being generally taken along the line and in the direction of arrows 3-3 of FIGURE 2 to more clearly illucstrate the configuration of the outer end of said discharge tube.

FIGURE 4 is a view of the discharge tube that corresponds to FIGURE 3 other than that said view is taken prior to the time the outer end of the tube is flattened and flared;

FIGURE 4A is an enlarged fragmentary cross sectional view of a modified discharge tube that may be used in place of that illustrated in FIGURE 3, provided the discharge tube is of a relative small diameter;

FIGURE 4B is a transverse cross sectional view taken ice along the line and in the direction of the arrows 4B4B of FIGURE 4A to more clearly show the formation of the film on the discharge end of the tube;

FIGURE 5 is an enlarged fragmentary top view, partly in cross section, of the discharge end of the nozzle of the first embodiment to more clearly show the flared end of the discharge tube of FIGURE 3;

FIGURE 6 is a longitudinal cross-sectional view of the second embodiment of the spray nozzle of this invention together with the suppy lines connected thereto, said view being generally taken along the line and in the direction of the arrows 66 of FIGURE 8 other than a portion of the discharge subassembly is not shown in crosssection;

FIGURE 7 is an end view of the nozzle of FIGURE 6, said view being generally taken along the line and in the direction of the arrows 77 of FIGURE 6 to more clearly show the relationship between the nozzle body bore, the outlet end of the discharge tube and the deflector plate;

FIGURE 8 is a plan view of the nozzle of FIGURE 6 generally taken along the line and in the direction of the arrows 88 to more clearly show the relative locations of the deflector plate, and the forward ends of the nozzle body and discharge tube; I 7

FIGURE 9 is a longitudinal cross sectional view of the third embodiment of this invention, said view being generally taken along the line and in the direction of the arrows 99 of FIGURE 10;

FIGURE 10 is generally an end view of the third embodiment showing portions in cross section, said view being taken along the line and in the direction of the arrows 1010 of FIGURE 9;

FIGURE 11 is an enlarged fragmentary cross sectional view generally taken along the line and in the direction of the arrows 1111 of FIGURE 10 to more clearly show the flared ends of the discharge tubes; and

FIGURE 12 is a diagrammatic illustration of operational features of the first two embodiments of this invention.

Referring now in particular to FIGURES 1, 2 and 5, the first embodiment of the spray nozzle of this invention, generally designated 10, will now be described. The spray nozzle 10 includes a nozzle body 11 that is elongated in an axial direction. The rearward end portion of the nozzle body has internal threads 12 to permit the nozzle body being threaded onto one end of the fluid supply line 13, the opposite end of the line being appropriately connected to a source of pressurized fluid 39. The forward axial end portion of the nozzle body in longitudinal cross section is tapered in an axially forward direction to be of decreasing radii in a forward direction, and is somewhat frusto-conical in shape wherein the minor base forms the outer end 11b of the body.

The nozzle body encloses a main chamber 14 which advantageously may be cylindrical in shape, an intermediate chamber 15 that is generally of a frusto-conical shape wherein one end thereof is coextensive with the main chamber, and an axially elongated bore 16 that at one end is coextensive with the minor base end of the intermediate chamber and at the other end opens to the atmosphere through the outer end 11b of the body. As it may be noted in FIGURE 1 the diameter of the bore 16 is substantially smaller than the diameter of the main chamber 14.

Mounted within the main chamber 14 and intermediate chamber 15 to extend outwardly through the bore 16 is a discharge subassembly 20 that is elongated in an axial direction and includes a discharge tube mounting member 21 having a generally cylindrical shaped main chamber 22 formed therein. The mounting member includes an externally threaded portion 21a to have an annular fitting 24 threaded thereon, said fitting in turn placing the liquid supply line 26 in fluid communication with the chamber 22. An annular seal member 25 is positioned in the fittin to provide a seal between members 21 and 24.

The end portion of line 26 connected to fitting 24 is located within the corresponding end portion of line 13 to provide an annular space between said end portions while the opposite end of line 26 is connected to a source of liquid 38. The liquid is forced under pressure through line 26 and into the discharge sub-assembly.

The opposite axial end portion 21b of the mounting member is of a larger cross sectional area and advantageously may be hexagonal in shape. The portion 21b has an axial aperture formed therein that opens into the chamber 22, there being an elongated tube 27 mounted on the portion 21 to have one end thereof extend through said aperture and open to the chamber 22. With the mounting member mounted in the hollow interior of the nozzle body, corner portions of the hex head 21b bear against the inner peripheral walls of the tapered intermediate chamber to form fluid passageways 30 whereby the fluid in the main chamber may pass between the inner peripheral wall of the inner chamber and the outer surface of the mounting body and thence through the annular space 31 between the inner peripheral wall of bore 16 and the outer peripheral surface of the tube, and also to position the discharge sub-assembly 20. The tube extends forwardly of the mounting member and axially through the bore, the outer diameter of the tube being substantially smaller than the diameter of said bore whereby the aforementioned annular space 31 is provided.

The outer axial end of the tube is flared and flattened at 27a to provide a planar liquid distributing surface, the outer edge of the tube being arcuately curved at 27b and the outer longitudinal edges of said flared portion 27a converging in a rearward direction from said arcuate edge to form a continuous extension of the tubular portion of the tube. In longitudinal vertical elevation the outer longitudinal edges of said flared portion intermediate the planar surface 27a and the tubular portion of the tube generally subtend a concave arc (see FIGURE 3).

In order to form the outward flared end portion described heretofore, particularly with intermediate diameter tubes, the outer end portion may be diagonally, cut as illustrated in FIGURE 4 and thence the portion illustrated under bracket A of FIGURE 4 pounded down to provide the flared flat surface 27a described heretofore.

In the event that a very small diameter (inside) discharge tube having an inside diameter in of the approximate range of 0.005 to 0.020 inch, it has been found that it is not necessary that the discharge tube have a flattened flared end portion. Rather a discharge tube 35 having an inside diameter D in the aforementioned range may be used in place of tube 27, the tube 35 being provided with a straight beveled cut 35a of 15 or alternately a curved beveled cut 35b (see FIGURE 4A). With tubes having such small inside diameters, the exposed tubing wall, which is of a thickness T as shown in FIGURE 4B, provides a surface on which the liquid film 37 forms, film 37 having film width that is the same as dimension T.

The structure of the first embodiment of the spray nozzle of this invention having been described the structure of the second embodiment, generally designated 40, will now be set forth. The embodiment 40 includes a nozzle body, generally designated 41, having an internally threaded portion 43 for being threaded on one end of a fluid supply line 42. The nozzle body also includes a generally cylindrical main chamber 44 that at one end opens to the hollow interior of the fluid supply line and at the opposite end opens to the intermediate chamber 45, the intermediate chamber being tapered in an axially forward direction to have the forward axial end open to one end of the axially extending bore 46. The forward end portion of the nozzle body which surrounds the intersimilar to that of members 21 and 24 of the first embodiment and connected as disclosed in accordance withthe disclosure relative the first embodiment, member 51 as illustrated has a non-threaded reduced end portion 51a with an annular recess formed therein for mounting an O-ring 55. Annular fitting 53 accordingly has an enlarged diameter bore into which the end portion 51a fits whereby the O-ring abuts against the peripheral wall of said bore to form a fluid seal between members 51, 53 and removably retain them in an assembled relationship.

As may be noted in FIGURE 6, one end portion of the liquid supply line 52 is located within the corresponding end portion of the fluid supply line 42, said one end portion of line 52 being mounted on the annular fitting 53 to place line 52 in fluid communication with the main chamber of the mounting member 51. The opposite end of line 52 is connected to a source of liquid which is forced under pressure through the line 52 to the discharge sub-assembly while the opposite end of line 42 is appropriately connected to a pressurized source of carrier fluid.

The forward end portion of the mounting member 51 which is hexagonal in cross section, abuts against the inner peripheral walls of the intermediate chamber in the same manner described relative to the first embodiment.

elongated tube 54, the mounting member main chamber being in fluid communication with the liquid supply line.

The tube is of sufflcient axial length that it extends out- Wardly through the bore and of a diameter to provide an annular fluid passageway between the inner peripheral wall of the bore and the outer circumferential surface of the tube.

Formed in the forward end portion of the nozzle body to have one end of the deflector plate 58 press fitted therein is a transversely elongated slot 59. As may be noted in FIGURE 7, the slot is formed such that the portion 46b of the annular space between the bore and the tube 54 opens to the bottom surface 58b of the deflector plate while the portion 46a opens to the top surface 58a of the deflector plate. The deflector plate is concavely curved (longitudinal cross section) to extend forwardly and divergingly curve outwardly from the longitudinal axis of the nozzle body, however, it is not flattened as illustrated in FIGURES 3 and 5); however,

due to the provision of the deflector plate, which in effect replaces the flared end portion of the discharge tube, the discharge tube may be cut off blunt as illustrated in FIGURES 6 and 8 (front edge perpendicular to the axis of the tube). With a blunt end discharge tube, the liquid passing through the tube will film out on the adjacent curved surface of the deflector plate over a wide range of nozzle pressures'including 1 to 30 p.s.i.g. and higher.

The structure of the third embodiment, generally designated 140, will now be set forth. The third embodiment includes a nozzle body 141 having an internal threaded rear portion 141a that encloses a main chamber, an intermediate chamber 141!) that is somewhat hemispherical in space, and a bore 1410 that opens to the atmosphere through the forward end portion, the forward end portion having an outer surface configuration Mounted on the mounting member 51 to have, one end open to the main chamber thereof is an axially very similar to that of the second embodiment. The intermediate chamber is located between the main chamber and the bore and places them in fluid communication with one another.

A first discharge subassembly, generally designated 143, includes a discharge tube mounting member 144 having an externally threaded reduced diameter end portion 144a that is threaded into the rear portion 141:: of the nozzle body and an internally rear portion 144b that encloses a main chamber. Axially forward of the main chamber and coextensive therewith is a generally hemispherical intermediate chamber 144c, the forward portion of chamber 1440 opening to bore 144d that extends through the end portion 144a. Mounted in the bore 144d is an elongated discharge tube 145, the tube 145 extending through the nozzle body intermediate chamber and bore 1410 to have its flared end 145a located closely adjacent the curved deflector plate 147. The deflector plate 147 advantageously is of the same shape as plate 59 and mounted on the nozzle body .141 in a manner corresponding to the mounting of plate 59 in nozzle body 41. The tube 145 and bore 141c provide an annular space to conduct fluid from chamber 141b to pass in contact with both the upper and lower surface of plate 147 whereas the fluid passing through tube 145 is only passed on contact with or above the upper surface of said plate.

A second discharge tube assembly, generally designated 150, includes a discharge tube mounting member 151 having an externally threaded reduced diameter end portion 151a that is threaded into the rear portion 144b of mounting member 144 and an internally threaded rear portion 15112 that encloses a main chamber. Axially forward of the last mentioned main chamber and coextensive therewith is generally hemispherical intermediate chamber 1510, the forward end of chamber 1510 opening to bore 151d that extends through the end portion 151a. Mounted in bore 151d is an elongated discharge tube 152 which is of a smaller diameter than tube 145 and extends axially through chambers 1440, 14112 to have its forward flared end 152:: overlay flared end 145a. One end of a liquid supply line 153 is threadedly connected to the internally thread end portion 151b, the opposite end being connected to a source 154 of a first liquid which is forced under pressure through line 153, and

tube 152 to film on the flared end 152a.

A source 156*of a second liquid is forced under pressure through line 157, radially extending passage 158, chamber 1440 and the annular space between tubes 145 and 152 to film over the flattened flared end 145a, a portion of passage 158 being threaded to have one threaded end of line 157 connected thereto. Likewise a source of pressurized fluid-160 is connected via line 161 to the nozzle body 141 to flow through passage 162, chamber 141b and the annular space between the wall of bore 141a and tube 145, the flow of fluid from source 160 over plate 147 being similar to that described relative the second embodiment.

The third embodiment is advantageously used in spraying where two different types of liquid mixtures are to be sprayed or where it is desired to spray a mixture of two chemicals, but due to reaction between the chemicals they can be mixed only shortly before they are sprayed. For example, it may be desired to simultaneously spray both a fungicide and an insecticide which undesirably react with one another if mixed prior to being sprayed. With the third embodiment the fungicide may be supplied through source 154 and the insecticide through source 156 while the pressurized carrier fluid (such as air) is applied through source 160. This way the insecticide cannot mix with the fungicide until they reach the flattened flared ends 152a and 145a, respectively, which gives the chemicals insufficient time to react before being transported by the carrier to the area to be sprayed. However, due to filming on the respectively flared ends and the deflector plate and subsequent formation of fine 6 droplets, the combined movements of the fungicide, insecticide and carrier cause an intimate mixing of the insecticide and fungicide prior to being transported to the area being sprayed.

In the event a resin is to be sprayed, for example an epoxy resin such as Descos Armito, sold by Desco International Association, the accelerator may be provided at 154, the resin at 156 and the carrier at 160. Thus the resin may be sprayed onto the desired surface without danger of setting prior to reaching the surface even though it is a fast setting resin. The ranges of pressures for the liquids and carrier may be the same as disclosed herein for the other embodiments.

In the event that a third liquid is to be sprayed in combination with two other liquids, the discharge subassembly is provided with a radial passage as illustrated for member 143 to connect source 154 to the intermediate chamber 1510 of the thus modified subassembly. Also another discharge subassembly similar to member 150 is provided, the primary difference being that said another subassembly would have a smaller diameter, axially longer discharge tube that would be extended through tube 152a when said another subassembly is connected to the modified subassembly 150. The source of the third liquid is connected to the another subassembly as illustrated with reference to source 154 to member 150.

In using the first embodiment of spray nozzle of this invention, the fluid supply line 13 is connected to a source of pressurized fluid, for example, air; while the liquid supply line 26 is connected to appropriate source of liquid which is forced under pressure through line 26. For example if the spray nozzle is to be used for humidifying purposes, then the liquid consists of water; whereas, if it is used for spraying, for example, insecticides, the line 26 is connected to a source of liquid that contains the desired type insecticide to be sprayed plus a suflicient amount of carrier, and/ or solvent to dilute the insecticide to the desired concentration. The pressurized air flows through the annular space provided between the discharge tube subassembly and the nozzle body, through the openings 30 (FIGURE 2) at a relatively high velocity (the openings 30 at 300-500 miles per hour), and thence through the annular space 31 over the outer flared end of the tube or if the diameter of the tube is small the forward non-flared end. At the same time liquid under pressure is forced through the fluid supply line into the chamber 22 and thence through the hollow interior of the tube and outwardly onto the planar surface 27a. The air flowing over the outlet end of the tube comes in contact with the liquid being discharged from the tube and causes the liquid to form a thin film on the planar surface 27a which then directly forms very small droplets (for example-less than 10 microns), the film being broken up before surface tension has a chance to recombine the droplets. As the film is directly converted to small droplets rather than to big drops and to small drops, it does not allow a film to break into steamlets (filaments) and thence into droplets.

Air being discharged under pressure through the outlet end of the annular space 31 causes air to flow in the direction of arrows 33, 33 along the outer surface of the taper end portion of the nozzle body. Since the end 11b is of a relatively small diameter, compared to the cross section dimension of the portion surrounding the main chamber, the air flow 3333 at the end 11b is generally forwardly and aids in dispersing the spray at the outer arcuate edge 27b of the flared end of the tube.

By causing the film to directly form small droplets, 10 to 30% of the amount of chemical insecticide that would otherwise be used, is suflicient since each of the small droplets has a smaller concentration of chemical, but due to the fact that there are a large number of the droplets there is provided better coverage and therefore requires smaller total amount of the chemical. Further through providing very small drops the total volume of the carrier used, for example water, is relatively low. That is, where normally 100 gallons of water would be used, with the spray nozzle of this invention, to 10 gallons is satisfactory for spraying the same quantity of insecticide and at the same time obtain better coverage. Thus the air jet primarily acts to break up the liquid mixture and secondarily to carry the droplets of insecticide to the material to be sprayed. With the nozzle of this invention in usage for humidification, the small water droplets coming off the edge 27b of the planar end of the tube.are so fine that they are in vapor form before traveling six inches. from the edge 27 b; however, if being used to spray for example insecticides evaporation usually will not take place this fast due to the chemicals being used.

In order to further illustrate the invention but not as a limitation thereof the following dimensions are set forth. The inner diameter of the bore 16 can be 0.0400.060 inch while the outer diameter of the tubular portion of the tube is 0.020 inch and the inner diameter is 0.010 inch. With the spraynozzle having the aforementioned dimensions and the water or other liquid to be sprayed under pressure of approximately pounds or less per square .inch and air under pressure of 1030 pounds per square inch, one-half gallon of liquid is sprayed per hour.

The operation of the secondembodiment of the spray nozzle of this invention is very similar to that described relative to the first embodiment other than for the additional features set forth hereinafter. The fluid supply line 42 is connected to a pressurized source of fluid such as air and the liquid supply line 52 connected to a pressurized source of liquid, for example water, said lines being connected to the nozzle body 41 and discharge tube subassembly 51, respectively. The water discharged through the tubular end portion of the tube 54 forms a very fine film as it passes over the planar surface of the flared end of the tube as described heretofore relative the first embodiment or over the deflector plate if a blunt end tube is provided; and the film forms very fine droplets as it leaves the outer arcuate edge 65 of the plate. That is with a flared end tube the fluid flow through the upper portion 46a of the annular passage subjects the liquid on the flared end to a first shear as it comes out of the tube to first form a film and then fine droplets or with a blunt end tube a first shear over the deflector plate. The fine droplets following the curved surface 580 of the deflector plate (arrow 60) move outwardly off the edge 65 and then are subjected to a second air shear in that the air flowing through the passageway portion 46b follows along the under curved surface 58b (arrow 61) to contact the droplets as they pass over the arcuate edge 65. For many purposes the deflector plate (even with a blunt end tube) gives an even better type spray than that obtained with the first embodiment, particularly, where larger quantities are desired since a larger diameter discharge tube (for example tube 54) can be used as the film is formed on the deflector plate, not on a flared tube. In this connection it is to be noted that even though the back surface 58b is curved in a forwardly direction to diverge from the axis of the bore the air still follows the back surface due to the Coanda eflect.

Advantages of the second embodiment over the first is that larger liquid quantities, for example, 2 gallons per hour, can be sprayed and also a more flatten spray is obtained which covers a larger area. As a result ease of spraying larger areas is facilitated.

Although the outer surfaces of the discharge tube mounting members has been described as being hexagonal where they abut against portions of the nozzle body it is to be understood they could be otherwise configured as long as sufficient space is provided for fluid to flow from the main chamber of the respective nozzle body to the bore or chambers that discharge to the atmosphere; Additionally it is to be understood that in the third embodiment the members 141, 144 and members 144, 150

respectively may be construed to be connected as (16."

scribed and illustrated relative to members 51, 53 of the second embodiment. For example end portion 141a may be non-threaded while end portion 144a likewise may be non-threaded but provided with an annular recess and an O-ring to form a fluid seal and hold the thus modified members 141, 144 in an assembled condition.

It is to be mentioned that anyone or all of the embodiments can be used with a carrier fluid (air) flow which is used primarily to transport the droplet mixture (provided it is not being used for humidification or etc. where liquid evaporates very rapidly) to a target area. As a further illustration of the. invention, the exit velocity of the carrier through the forward axial opening 200 of the,

nozzle body 201 can be in the range of 50 to mph. wherein a low pressure large volume flow of carrier fluid passes into the nozzle body and a higher pressure-low volume flow of liquid passes into the discharge tube assembly 202, as indicated on the diagrammatical illustration of FIGURE 12. The exit velocity of the liquid from the discharge assembly in such cases is in the range of 300-500 m.p.h. By using a large volume flow-low pressure flow of fluid, fluid can be transported a distance up to 200 diameters, D, of the exhaust jet. Hence if D, is 1 inch, thefluid in the exhaust jet is transported up to 200 inches.

In the first embodiment, if a relative larger diameter discharge tube is used, the liquid film forms on the flared end of the discharge tube while if it is of relative small diameter the discharge end of tube need not be flared but only beveled as previously indicated. In the second embodiment, the discharge tube flared end portion is in effect replaced by the curved deflector plate. In other words, the film forms on a curved deflector plate for the second embodiment.

blunt since liquid will film-out on one side of the curved surface over a wide range of nozzle pressures of 1-30 p.s.i.g. and probably higher.

With respect to the second and third embodiments it is to be mentioned by using a deflector plate having .a

larger radius of curvature, a wider angle of spray is; obtained. Also with respect to each of the embodiments.

the axial distance between the annular end of the discharge tube and the arcuate edge of the flared end portion or deflector plate on which the film is formed is increased if higher viscosity materials are to be sprayed while keeping the pressures the same.

As many widely apparently different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that we do not limit ourselves to the specific embodiments herein.

What we claim is:

1. A spray nozzle comprising a longitudinally extending nozzle body having a main chamber and a first longitudinally extending passage placing the main chamber in fluid communication with the atmosphere, said nozzle body:

having a transverse slot formed in the outlet end to intersect said passage, a deflector plate mounted in said slot to extend forwardly of said nozzle body and a first discharge i tube subassembly including ,a discharge tube mounting member having a main chamber and extendable into the nozzzle body main chamber and an elongated tube joined to said mounting member to open into the mounting member main chamber, extend into said passage and being elongated in the direction of elongation of said passage,

said tube having a discharge end overlapping one surface Thus in the second embodiment, the front axial end of the discharge tube may be cut off relative said passage to have fluid flowing through the second passageway pass on either side of the deflector plate.

3. The structure of claim 2 further characterized in that said deflector plate is concavely curved in longitudinal cross section.

4. A spray nozzle comprising a longitudinally extend-- ing nozzle body having a main chamber and a first longitudinally extending passage placing the main chamber in fluid communication with the atmosphere and a first discharge tube subassembly including a first discharge tube mounting member having a main chamber and extendable into the nozzle body main chamber and an elongated tube having a discharge end joined to said mounting member to open into the first mounting member main chamber, extend into said passage and being elongated in the direction of elongation of said passage, said first discharge tube and first mounting member providing a first fluid passageway, and said first subassembly and nozzle cooperatively providing a second fluid passageway that discharge to the atmosphere through said passage for transporting the fluid flowing through said first passageway, and a second discharge tube subassembly that is at least extendable into the first discharge tube subassembly main chamber and through the aforementioned tube, said second discharge tube assembly including a second discharge tube mounting memher having a main chamber and an elongated second discharge tube opening at one end into the last mentioned chamber and having a discharge end portion that opens to the atmosphere at a location adjacent the first mentioned tube discharge end, said second discharge tube being of a smaller diameter than the first tube to provide an annular passageway between said tubes.

References Cited by the Examiner UNITED STATES PATENTS 801,360 10/1905 Christensen 239423 971,516 10/1910 Beaver 239523 3,059,859 10/1962 Hupp 239422 3,112,882 12/1963 Gilbert 239422 FOREIGN PATENTS 819,642 11/1951 Germany.

EVERETT W. KIRBY, Primary Examiner. 

1. A SPRAY NOZZLE COMPRISING A LONGITUDINALLY EXTENDING NOZZLE BODY HAVING A MAIN CHAMBER AND A FIRST LONGITUDINALLY EXTENDING PASSAGE PLACING THE MAIN CHAMBER IN FLUID COMMUNICATION WITH THE ATMOSPHERE, SAID NOZZLE BODY HAVING A TRANSVERSE SLOT FORMED IN THE OUTLET END TO INTERSECT SAID PASSAGE, A DEFLECTOR PLATE MOUNTED IN SAID SLOT TO EXTEND FORWARDLY OF SAID NOZZLE BODY AND A FIRST DISCHARGE TUBE SUBASSEMBLY INCLUDING A DISCHARGE TUBE MOUNTING MEMBER HAVING MAIN CHAMBER AND EXTENDABLE INTO THE NOZZLE BODY MAIN CHAMBER AND AN ELONGATED TUBE JOINED TO SAID MOUNTING MEMBER TO OPEN INTO THE MOUNTING MEMBER MAIN CHAMBER, EXTEND INTO SAID PASSAGE AND BEING ELONGATED IN THE DIRECTION OF ELONGATION OF SAID PASSAGE, SAID TUBE HAVING A DISCHARGE END OVERLAPPING ONE SURFACE OF THE DEFLECTOR PLATE, SAID DISCHARGE TUBE AND MOUNTING MEMBER PROVIDING A FIRST FLUID PASSAGEWAY, AND SAID SUBASSEMBLY AND NOZZLE COOPERATIVELY PROVIDING A SECOND FLUID PASSAGEWAY THAT DISCHARGES TO THE ATMOSPHER THROUGH SAID PASSAGE FOR TRANSPORTING THE FLUID FLOWING THROUGH SAID FIRST PASSAGEWAY. 